When it comes to smartphones the advice is as for the PC; if it looks to good to be true, then it generally is.
Whilst Apple look to pre-empt nefarious activity by limiting access to the iTunes store, Android users are not so lucky. As for downloads and hyperlinks, as you might be presented within emails, follow the same common sense rules as you would apply to your PC. Safe surfing.
As smartphones become more critical to the everyday lives of average people, hackers are spending more and more time creating different versions of their viruses to infiltrate several different mobile operating systems. Mobile malware can do just about everything a virus on your PC can do – and more. For starters, viruses can bog down your phone's processing speeds, hack your email and send out spam to all your contacts, randomly delete your important files and calendar entries, and initiate system-wide crashes. One of the worst and most recent viruses that targets only mobile phones eventually causes the infected phone to lock up completely, making it unusable. However, some smartphone malware can access your camera and photos. It can steal all the images saved on your camera and actually hijack the camera to take photos at random.